Why do some hand guns say no reloads???
That depends on who is making the bullets. Bullet casters are making lead bullets now that won't lead the barrel and will hold up to magnum velocity. I use Linotype in my cast bullets and I guarantee they won't lead a barrel.From what I've read, glocks barrels don't do well with lead bullets, common in reloading to reduce price.
Pretty much what the others said. If someone doesn't know what they're doing, the rounds that they reload could do some serious damage. That's why in all the years I've shot rounds at the range, I've never shot reloads. The only reloads I would EVER shoot are those done by me (when I get around to learning :smile.